relating to or suggesting a belief in the Christian concept of a 1000-year period during which Christ is to rule on earth and happiness, holiness, and human perfection are to prevail;
e.g. He outlines his millenarian beliefs in a treatise.
(adjective)
relating to or characteristic of a millennium, i.e. a period of 1000 years;
e.g. Geologists can examine millenarian signs in rocks to determine how old the rocks are.
(noun)
a believer in the Christian doctrine of the millennium (1000 years) during which Christ will rule on earth and happiness, holiness, and human perfection will prevail;
e.g. They recognize her as a millenarian and call her beliefs into question.